H Cladding / Coverings

H1 GLAZED CLADDING/COVERING
H10 Patent Glazing
H11 Curtain Walling
H12 Plastics Glazed Vaulting/Walling
H13 Structural Glass Assemblies
H14 Concrete Rooflights/Pavement Lights
H2 SHEET/BOARD CLADDING
H20 Rigid Sheet Cladding
H21 Timber Weatherboarding
H22 Timber Board Roofing
H3 PROFILED/FLAT SHEET CLADDING/COVERING
H31 Metal Profiled/Flat Sheet Cladding/Covering
H4 PANEL CLADDING
H40 Glass Reinforced Cement Panel Cladding/Features
H42 Precast Concrete Panel Cladding/Features
H43 Metal Panel Cladding/Features
H49 Vitreous Enamel Panels
H6 SLATE/TILE CLADDING/COVERING
H60 Plain Roof Tiling
H62 Natural Slating
H63 Reconstructed Stone Slating/Tiling
H64 Timber Shingling
H65 Single Lap Roof Tiling
H7 MALLEABLE SHEET COVERINGS/CLADDING
H71 Lead Sheet Coverings/Flashings
H72 Aluminium Sheet Coverings/Flashings
H73 Copper Strip/Sheet Coverings/Flashings
H74 Zinc Strip/Sheet Coverings/Flashings
H75 Stainless Steel Strip/Sheet Coverings/Flashings
H9 OTHER CLADDING/COVERING
H90 Tensile Fabric Covering
H91 Thatch Roofing
H92 Rainscreen Cladding/Overcladding

H1 Glazed Cladding / Covering

CONSIDER:
• Integrated PV systems
- PV panels require ventilation on rear face to maintain efficiency
- Rainscreen systems will work better See H15 or H92

H10 Patent Glazing

RECYLCLING:
• Use recycled aluminium in preference to virgin aluminium, significant reduction in CO₂ generated
• Design for recycling: avoid coatings as they discourage recycling due to the high levels of purity required in aluminium, PPC and PVF2 are more difficult anodizing is an alloy of aluminium and is more readily recycled, mill finish is best but not everybody likes the oxides that form on aluminium
- Mill finished aluminium reflects the colour of the sky: blue, white, grey or sun .

H11 Curtain Walling

CONSIDER:
• Exclusion of UV light, use PVB Interlayers in laminated glass
• U Values of 1.0 W/m²K are achievable
• Use Double Glazed Sealed Units to BS 5713 and BSI Kitemarked
• Use Low E glass generally
• Use Argon, Pentane or CO₂ in cavities
• Timber framed curtain walling
- Timber: Hardwood, Heartwood of softwood, Slow grown timber, recycled timber
• Uncoated aluminium (but marginally reduces component life)
• FSC approved timber sources and timber based materials See Z10.

AVOID:
• Single glazing
• Condensation on inner face
• Excessive glazing on north face if inadequately specified (heat loss in winter)
• Excessive glazing on south face (heat gains in summer unless it is managed and exploited)
• PVC See Z50
• Powder coated and painted aluminium
• CCA (Copper Chrome Arsenic) Treated softwood, See Z12
• Double Glazed Sealed Units only offering U Value 2.0 W/m²K.

H12 Plastics Glazed Vaulting/Walling

AVOID:
• Single glazing.
• Condensation on inner face.
• Excessive glazing on north face if inadequately specified (heat loss in winter).
• Excessive glazing on south face (heat gains in summer unless it is managed and exploited).
• PVC See Z50.
• Double Glazed Sealed Units only offering U Value 2.0 W/m²K.

H13 Structural Glass Assemblies

CONSIDER:
• Exclusion of UV light, use PVB Interlayer in laminated glass
• U Values of 1.0 W/m²K are achievable
• Use Double Glazed Sealed Units to BS 5713 and BSI Kitemarked
• Use Low E glass generally
• Use Argon, Pentane or CO₂ in cavities

H14 Concrete Rooflights/Pavement Lights

CONSIDER:
• Cement and aggregate substitution in concrete elements See E10
• Glass lenses may offer better U value than concrete
• Some daylight via glass lenses may reduce demand for some artificial lighting in space below

H20 Rigid Sheet Cladding

RECYCLING:
• Consider recycled plastic cladding. (eg Keralit)

H21 Timber Weatherboarding

CONSIDER:
• Durable species without preservative treatment.
• Locally sourced durable softwood and hardwood.
• Unseasoned, untreated, unfinished oak can be as cheap as treated softwood.
• Architect to design joinery to minimise waste, be aware of position in log, sections sizes and lengths, before deciding use and joint patterns of hardwoods.
• FSC certified timber sources, timber board products and timber based materials See G20, Z10.

RECYCLING:
• At the end of useful life use as fuel or mulch or compost.

AVOID:
• Indonesian Hardwood - most is illegally logged, destroys forests, communities and habitation.
• Preservative treated perishable softwood. See G20, Z10 and Z12.
• PVC substitute for timber See Z50.
• Virgin Plastics See Z50.

H22 Timber Board Roofing

AVOID:
• Indonesian Hardwood - most is illegally logged, destroys forests, communities and habitation.
• Preservative treated perishable softwood. See G20, Z10 and Z12.

H31 Metal Profiled/Flat Sheet Cladding/Covering

CONSIDER:
• Sheets made to run from ridge to eaves without joints and made to order to minimise cutting and waste.

RECYCLING:
• Use recycled aluminium in preference to virgin aluminium, significant reduction in CO₂ generated.
• Design for recycling: avoid coatings as they discourage recycling due to the high levels of purity required in aluminium, PPC and PVF2 are more difficult anodizing is an alloy of aluminium and is more readily recycled, mill finish is best but not everybody likes the oxides that form on aluminium.
• Mill finished profiled aluminium roofing reflects the colour of the sky: blue, white, grey or sun.
• Aluminium (uncoated is Recycleable).
• Kal-zip claim a high level of recycled content in their products.

AVOID:
• Composites that are difficult to recycle, easily damaged and unlikely to be reused.
• Foamed plastics in composites (petrochemical and non-renewable, toxic fumes in fires).

H40 Glass Reinforced Cement Panel Cladding/Features

CONSIDER:
• Aggregate substitution See E10.
• Cement Substitution See E10.

H42 Precast Concrete Panel Cladding/Features

CONSIDER:
• Aggregate substitution See E10.
• Cement Substitution See E10.

H43 Metal Panel Cladding/Features

RECYCLING:
• Use recycled aluminium in preference to virgin aluminium, significant reduction in CO₂ generated.
• Design for recycling: avoid coatings as they discourage recycling due to the high levels of purity required in aluminium, PPC and PVF2 are more difficult anodizing is an alloy of aluminium and is more readily recycled, mill finish is best but not everybody likes the oxides that form on aluminium.
• Mill finished aluminium reflects the colour of the sky: blue, white, grey or sun.

H49 Vitreous Enamel Panels

CONSIDER:
• Very long life cladding materials, 100 years is reasonable expectation.

H6 Slate/Tile Cladding/Covering

RECYCLING AND REUSE:
• Most materials are recyclable in some form.
• Slates, tiles and shingles are inherently demountable and should be removed, collected, palleted, protected and reused.

H60 Plain Roof Tiling

CONSIDER:
• Handmade clay plain tiles
• Local sourced materials.

H62 Natural Slating

CONSIDER:
• For every tonne of roofing slate there is 100 tonnes of waste.
- Quarries are beginning to realise the value of the waste as secondary aggregates for use in concrete, blockwork, dry stone walling, loose gravel paving and as mulch in landscape.
- There are 6000 m tonnes of secondary waste throughout the UK, mostly remote in Scotland, Wales and the West Country.

AVOID:
• Imported slate from places like the Far East and Spain - the transportation adds considerably to the embodied energy.

H63 Reconstructed Stone Slating/Tiling

CONSIDER:
• Using reconstituted slate roofing containing recycled natural slate.

H64 Timber Shingling

RECYCLING, RECOVERY & REUSE:
• Timber shingles are inherently demountable and should be removed, collected, palleted, protected and reused.
• Recycle timber scraps.
• At the end of their useful life timber shingles can be used as fuel to recover their energy.

H65 Single Lap Roof Tiling

CONSIDER:
• Plan roofs to be multiple modules of roof tiles to reduce cutting to minimum and if possible zero.

RECYCLING:
• Single lap roof tiles are inherently demountable and should be removed, collected, palleted, protected and reused.
• Sufficient quantities of the same tiles could be recycled as aggregate in more concrete.

AVOID:
• Replacing slate roofing with concrete tiles - the increased weight will lead to deflection and, with time ,additional creep- leading to distortion and possible opening up of joints - so thus making them more vulnerable to water and weather penetration.

H71 Lead Sheet Coverings/Flashings

CONSIDER:
• Replacing lead in existing pipelines with copper.

RECYCLING:
• Its important to collect all off-cuts and waste to return all to be recycled.
• Roofing, flashing, DPC’s and general roof to wall sealing should be
100% recycled Lead sheet recovered from building demolition or other reclaimed sources.

AVOID:
• Lead in water supply pipework.
• Lead guttering supplying rainwater harvesting storage if used on garden producing food crops.